a. 1. Of or pertaining to a tree, or to trees; of nature of trees. Cowley. [ 1913 Webster ]

2. Attached to, found in or upon, or frequenting, woods or trees; as, arboreal animals. [ 1913 Webster ]

Woodpeckers are eminently arboreal. Darwin. [ 1913 Webster ]

a. Furnished with an arbor; lined with trees. “An arboreal walk.” Pollok. [ 1913 Webster ]

a. [ L. arboreous, fr. arbor tree. ] 1. Having the form, constitution, or habits, of a proper tree, in distinction from a shrub. Loudon. [ 1913 Webster ]

2. Pertaining to, or growing on, trees; as, arboreous moss. Quincy. [ 1913 Webster ]

n. The state of being arborescent; the resemblance to a tree in minerals, or crystallizations, or groups of crystals in that form; as, the arborescence produced by precipitating silver. [ 1913 Webster ]

a. [ L. arborescens, p. pr. of arborescere to become a tree, fr. arbor tree. ] Resembling a tree; becoming woody in stalk; dendritic; having crystallizations disposed like the branches and twigs of a tree. “Arborescent hollyhocks.” Evelyn. [ 1913 Webster ]

adj. 1. resembling a tree in form and branching structure.
Syn. -- arboreal, arboreous, arborescent, arboriform, dendriform, dendroid, dendroidal, treelike, tree-shaped. [ WordNet 1.5 ]

n. [ OF. arboret, dim. of arbre tree, L. arbor ] A small tree or shrub. [ Obs. ] Spenser. [ 1913 Webster ]

Among thick-woven arborets, and flowers
Imbordered on each bank. Milton. [ 1913 Webster ]

‖n.; pl. Arboreta [ L., a place grown with trees. ] A place in which a collection of rare trees and shrubs is cultivated for scientific or educational purposes. [ 1913 Webster ]